.... The function _exit () is like exit (3), but does not call any functions registered with atexit (3) or on_exit (3). Open stdio (3) streams are not flushed. On the other hand, _…...y locks are not preserved ( mlock (2), mlockall (2)). • Exit handlers are not preserved ( atexit (3), on_exit (3)). • The floating-point environment is reset to the default (see…